Peters



(No Model.)

MAMBLE COPY G. S. STRONG. I

ENGINE VALVB.

Patented July 1 0, 1888.

N. PETERS. Phclo-Lllhognphcr, Walhinglon, DC.

2 She'etsSheet 1.

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(No Model.)

' G. S. STRONG.

ENGINE VALVE. N0. 385,96'7. Patented July lO, 1888.

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2 Sheets-Sheet 2.

UNITED STATES ATENT OFFICE.

GEORGE s. STRONG, or NEW YORK, a. Y.

ENGINE-VALVE.

SPECIFICATION forming part of Letters Patent No. 385,967, dated July 10,1888.

Application filed January 23, 1888. Serial No. 161,639.

To all whom it may concern:

Be it known that I, GEORGE S. STRONG, a citizen of the United States,and a resident of New York city, New York, have invented lmprovementsinEngineValves, ofwhich the following is a specification.

The object of my invention is to so construct the valve and valve-seatof an engine that the valve can be fitted to its seat prior to attachingthe seat to the cylinder, and that the valveseat will beselt-sustainingin its place, as fully described hereinafter.

In the accompanying drawings, Figure 1 is a transverse sectional view ofa steam-engine cylinder provided with my improvements. Fig. 2 is asection on theline l 2, Fig. 1. Fig. 3 is a plan view of one corner ofthe cylindercasing, showing the inlet and exhaust valves; and Fig. 4 isa detached section on the line 3 4, Fig. 2.

O is the cylinder, having at each end the usual inlet-ports, a, andexhaust ports I), the inlets and exhausts being governed by theslide-valves A and B, respectively, A being the inlet-valve and B theoutlet. These slidevalves A and B are seated in independent seats E andF, respectively, adapted to suitable orifices, valve and seats are ofthe ordinary gridiron pattern, having a series of openings formed bybars for the passage of steam to or from the cylinder. The valve seatsare oblong in cross section, as shown in Fig. 4, and their edges e e aresegmental or rounded to fitsnugly, like plugs, in the cylindricalorifices G H, which are bored out in the casing. The lower ends, of theseats are tapered or shouldered to correspond with the bottom 9 of theorifices, Figs. 1 and 2, and each seat has an extension, z, adapted toenter an opening in the bottom of the casing. A bolt, j, passing througha plate or washer, p, secures the seat firmly to the cylinder-casing.The seat can be set to any desired angle in respect to the opening intothe cylinder previous to securing the seat firmly to the casing by thebolt j. The seat, it will be seen on reference to Fig. 3, extends onboth sides of a central plane, 6, drawn through the cylindrical orifice,which it occupies, and is thus self-sustaining in its place. Thisbearing-surface of the seat on both sides of the central plane, 6,extends throughout the length of the seat, so that the latter is GH, inthe cylinder-casing. The

(No model.)

strong enough to resist heavy steam-pressures and rigid enough topreserve truly a plane surface for the valve to work on.

Each valve is wholly within its seat, being adapted to slide in groovesat each side, as shown in Fig. 4, formed by the face of the seat and theflanges Z Z. The valveis not held rigidly to the seat by these flanges,but is kept up thereto by-the steam-pressure of the engine, for thevalves are so set in respect to the parts that the pressure of the steamwill tend to keep the valve A on its seat, while the pressure ofexhaust-steam will tend to keep the valve B to its seat. In the case ofthe steam-valve I prefer to leave a little play between the overlappingedges of the flanges and the valve, as shown in Figs. 3 and 4; but thisis not essential. The valves can-have the necessary reciprocating motionimparted to them by any of the usual valve-operating mechanisms now inuse.

By the above-described construction I am enabled to fit slide-valves totheir seats previous to the placing of them in the cylinder, and theseats being adapted to cylindrical orifices fit like plugs, so that muchfine workmanship and skill are dispensed with, and a worn out valve andseat can readily be replaced without the usual delay attending repairsof ordinary valves and seats.

I claim as my invention- 1. The combination of the casing of an engine-cylihder having a cylindrical Orifice with a removable valve-seathaving segmental or curved edges adapted to fit snugly to thesides ofsaid orifice and extending throughout the length of the seat onboth'sides of a central plane through theorifice, and a slide-valvewholly within the seat.

2. The engine-cylinder having inlet and exhaust passages and an orificewith a conical or shouldered bottom, in combination with a correspondingvalve-seat adapted to the orifice, plate and bolt securing the seat tothe casing, and a slidevalve carried by said seat. In testimony whereofI have signed my name to this specification in the presence of twosubscribing witnesses.

GEO. S. STRONG.

Witnesses:

WM. OHEsTER WELLs, HURER'r Howsou.

